Velocity Slip in a Deep-sea Slurry Pump and Its Effect on Particle Transportation

Document Type : Regular Article


1 Zhejiang Sci-Tech University, Hangzhou 310000, China

2 Changsha Research Institute of Mining and Metallurgy, Co. Ltd., Changsha 410000, China



The slurry pump, which forms the core equipment of the deep-sea mining (DSM) system, provides lifting power for the ore from the seabed to the sea level, which is crucial for the safety of coarse ore particle transportation. Velocity slip plays a significant role in revealing the migration of the pump particles. Therefore, this study analyzes the velocity slip in a slurry pump using the computational fluid dynamics–discrete element method (CFD-DEM) for the first time. The relationship between the pump head and velocity slip was proposed and verified in this study based on the velocity triangle and Euler equation of the solid-liquid two-phase flow in the impeller. The effects of different particle sizes on the velocity slip are compared in detail. According to the computational results, the head depends on the larger velocity slip of the impeller outlet and lower velocity slip at the inlet. The peak value of the velocity slip was significantly reduced, and the peak position of the velocity slip and zero-point position moved backward for particle sizes ranging between 5-15 mm. This study provides a reference for the problems of particle migration and velocity slip in slurry pumps.


Main Subjects

Chen, B., Song, B. L., Tu, B. C., Zhang, Y. M., Li, X. J., Li, Z. G. (2021) Effect of Rotation
Speed and Flow Rate on Slip Factor in a
 Centrifugal Pump. Shock and Vibration,1-4.
Dong, L., Cheng, T., Ding, S., & Fu, B. (2017). CFD-DEM simulation for distribution and motion feature of crystal particles in centrifugal pump. International Journal of Fluid Machinery Systems, 10.
Hong, G. J., Zhang, Q. B., & Yu, G. L. (2016). Trajectories of coarse granular sediment particles in a simplified centrifugal dredge pump model. Advances in Mechanical Engineering, 8(11)
Li, Y. L., Yuan, S. Q., Wang, X. K., Tan, S. K., & Mao. J. Y. (2016) Comparison of flow fields in a centrifugal pump among different tracer particles by particle image velocimetry. Journal of Fluids Engineering-Transactions of the Asme, 138.
Li, Y. W., Liu, S. J., & Hu, X. Z. (2019). Research on rotating speed's influence on performance of Deep-Sea lifting motor pump based
on DEM-CFD. Marine Georesources
 & Geotechnology,
37(8), 979-88.
Liu, S. J., Li, Y. W., Hu, X. Z., & Dai, Y. (2019a, January 12-13). Prediction of Quasi - fluid Performance in Different Volume Concentration of Deep Sea Mining. International Conference on Intelligent Transportation, Big Data & Smart City (ICITBS), Changsha, PEOPLESR CHINA 2019.##
Liu, S. J., Wen, H., Zou, W. S., Hu, X. Z., & Dong, Z., (2019b, January 12-13). Deep-Sea Mining Pump Wear Prediction Using Numerical two-phase Flow Simulation. International Conference on Intelligent Transportation, Big Data & Smart City (ICITBS), Changsha, PEOPLES R CHINA 2019.##
Ning, C., Li, Y. L., Huang, P., Shi, H. B., Sun, H. C. (2022) Numerical analysis of single-particle motion using CFD-DEM in
varying-curvature elbows. Journal of Marine
Science and Engineering
, 10.
Pei, Y. J., Liu, Q. Y., Wang, C., & Wang, G. R. (2021). Analytical methods and verification of impeller outlet velocity slip of solid-liquid disc pump with multi-type blades. Arabian Journal for Science and Engineering, 46 6835-47.
Peng, G. J., Chen, Q., Bai, L., Hu, Z. Q., Zhou, L., & Huang, X. (2021a) Wear mechanism investigation in a centrifugal slurry pump impeller by numerical simulation and experiments. Engineering Failure Analysis, 128.
Peng, G. J., Tian, L., Chang, H., Hong, S. M., Ye, D. X., & You, B. J. (2021b) Numerical
and experimental study of hydraulic
performance and wear characteristics
of a slurry pump. Machines, 9.
Su, X., Tang, Z., Li, Y., Zhu, Z., & Balaz, P. J. E. (2020). Research of particle motion in a two-stage slurry transport pump for deep-ocean mining by the CFD-DEM method. 13(24), 6711.
Sun, D. P., & Liu, H. X. (2022). A probability model for predicting the slip velocity of large particles in vertical pipes. Powder Technology, 397.
Tang, C., & Kim, Y. J. (2020). CFD-DEM simulation for the distribution and motion feature of solid particles in single-channel pump. Energies, 13(19).
Wei, Z. B. (1997). Study on two-phase flow theory of solid-liquid pump. Coal Mining Machinery, (4), 3 (in China).##
Wen, H., Liu, S. J., Zou, W. S., Hu, X. Z., & Dong, Z. (2019, January 12-13). Effects of Particle Diameter on Erosion Wear Characteristic of Deep-Sea Mining Pump. International Conference on Intelligent Transportation, Big Data & Smart City (ICITBS), Changsha, Peoples R China 2019.##